Background
Menaquinone-7 (MK-7) is a type of vitamin K that has a longer half-life and stays in the body for a more extended period compared to other types of vitamin K. Recently, the effects of this vitamin on body weight, glycemic control, and lipid profiles have garnered much attention. Aim of the review: This systematic review and meta-analysis were performed to evaluate the effects of MK-7 on anthropometric measurements, glycemic indices, and lipid profiles.
Methods
A systematic search via appropriate keywords was conducted in electronic databases including PubMed, Scopus, Web of Science, and Google Scholar up to October 2023 to obtain relevant original articles. The quality of studies was evaluated using the Cochrane Collaboration tool. Six original articles met our criteria and were included in the analysis.
Results
Statistical analysis showed that MK-7 had a desirable effect on inulin (SMD= −0.56; 95 % CI: −0.77, −0.36; P = 0.000, I2 = 84 %, P = 0.000), HbA1c (SMD=-0.32; 95 % CI: −0.55, −0.09; P = 0.007, I2 = 86.8 %, P = 0.000), and homeostatic Model Assessment for Insulin Resistance (HOMA-IR) (SMD= −0.56; 95 % CI: −0.76, −0.35; P = 0.000, I2 = 84.3 %, P = 0.000). Additionally, subgroup analysis revealed negligible effects of MK-7 on total cholesterol (TC), insulin, HbA1c, and HOMA-IR in both genders of patients who received ≤ 90 mg MK-7 for less than 12 weeks. However, MK-7 didn’t have any meaningful effect on other factors.
Conclusion
Based on the findings of the present systematic review and meta-analysis, MK-7 may have beneficial effects on glycemic control and TC, although further highly qualified original research is needed for a consistent conclusion.
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